Antenna



FIG. 1 is a bottom perspective view of an antenna in accordance with our design;

FIG. 2 is a top perspective view of the antenna of FIG. 1;

FIG. 3 is a bottom view of the antenna of FIG. 1;

FIG. 4 is a side elevation view of the antenna of FIG. 1;

FIG. 5 is another side elevation view of the antenna of FIG. 1;

FIG. 6 is an end view of the antenna of FIG. 1;

FIG. 7 is another end view of the antenna of FIG. 1; and,

FIG. 8 is a top view of the antenna of FIG. 1. 

CLAIM The ornamental design for an antenna, as shown and described. 